Master reset code for M600i

Hi, I am trying to do the master reset, but I can't find any code that will work. I've tried 0000, 00000, 1234, 12345, 1111, the last 4 digits of the previously registered phone number, and still nothing. Any ideas? By the way, the phone lock screen shows all locks are OFF. IMEI : 35931500 032053 2

I am running a fleet of 50 of these devices. In my experience running SEUS is a much better method of rebuilding the M600i as the master reset will not restore everything to factory conditions. You can get the the Update Service from the SE website.

The security code can be changed and still be in effect with all locks off. Try 6 0's (000000). I didn't see that listed in the things you've attempted. If its been changed, the only way to determine that is to contact the previous owner and see if they remember it. If not, it will have to have all new software written to the phone. Basically like a format / reinstall.

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Please help, I flushed my phone's GDFS file to my friend's M600i and it seems locked phone code and can not boot this phone. Do help me to get Master Reset key, the phone's information : IMEI:35931500-401250-5. thks !